NGWS SDK Documentation  

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/Ob (In-line Function Expansion)

Feature Only in Professional and Enterprise Editions   Code optimization is supported only in Visual C++ Professional and Enterprise Editions. For more information, see Visual C++ Editions.
/Ob{0|1|2}

The In-line Function Expansion (/Obn) options control inline expansion of functions, where n is one of the following:

Command line Project settings Description
/Ob0 Disable Disables inline expansion (default)
/Ob1 Only __inline Expands only functions marked as inline or __inline or, in a C++ member function, defined within a class declaration (default with /O1, /O2, and /Ox)
/Ob2 Any Suitable Expands functions marked as inline or __inline and any other function that the compiler chooses (expansion occurs at compiler discretion—often referred to as “auto-inlining”).

This option requires that you enable optimizations using /O1, /O2, /Ox, /Ot, or /Og.

The compiler treats the inline expansion options and keywords as suggestions. There is no guarantee that functions will be inlined. You cannot force the compiler to inline a particular function.

You can also use #pragma auto_inline to exclude functions from being considered as candidates for inline expansion. Also see #pragma intrinsic.

See Also

/O options (Optimize Code) | Compiler Options | Setting Compiler Options